Energy & Environment Tools
Assess the economics of photovoltaics realistically: our energy tools calculate the yield, savings and payback of your solar installation. The models account for location, orientation and the current feed-in tariff.
The PV Yield Calculator estimates the annual generation of your system. Payback and maintenance-cost calculators evaluate long-term returns, while balcony power plant and battery storage calculators help you choose the right size.
Energy & Environment 8
Solar Yield Calculator
Estimate the annual solar yield of your PV system based on region, orientation and roof tilt angle, entirely in your browser.
Solar Payback & ROI Calculator
Find out when your PV system pays off, with break-even time and expected return on investment, entirely local and private. Runs in your browser, GDPR-compliant.
Solar Maintenance & Repair Cost Estimator
Estimate the running costs of your PV system, from inverter replacement to regular cleaning, entirely in your browser.
Balcony Solar (Plug-in PV) Calculator
Work out whether your balcony solar system pays off, with calculated savings and required payback period, all local. Runs in your browser, GDPR-compliant.
Home Battery Storage Calculator
Check whether a home battery pays off, with calculated savings and an honest cost assessment, entirely in your browser.
Feed-in Tariff Calculator
Estimate your PV feed-in income by entering the annual yield and tariff yourself, since the rate varies by commissioning year. GDPR-compliant.
Solar Funding Overview
A current overview of the main funding routes for photovoltaics, storage, balcony solar and heating: 0 % VAT, tax exemption, EEG feed-in tariff, KfW 270, KfW 442, KfW 458 and BAFA. GDPR-compliant.
Electricity Cost Calculator
Find out how much an appliance costs to run in a year, from wattage, daily use and your electricity price. Presets for common household devices, fully in your browser.